refactor: remove unused image element imports

Author: kaiquegazola

lib/src/builtins/image_builtin.dart

@@ -2,7 +2,6 @@ import 'dart:convert';
 
 import 'package:flutter/material.dart';
 import 'package:flutter_html/flutter_html.dart';
-import 'package:flutter_html/src/tree/image_element.dart';
 
 class ImageBuiltIn extends HtmlExtension {
   final String? dataEncoding;

packages/flutter_html_svg/lib/flutter_html_svg.dart

@@ -1,10 +1,9 @@
 library flutter_html_svg;
 
 import 'dart:convert';
+
 import 'package:flutter/material.dart';
 import 'package:flutter_html/flutter_html.dart';
-// ignore: implementation_imports
-import 'package:flutter_html/src/tree/image_element.dart';
 import 'package:flutter_svg/flutter_svg.dart';
 
 // TODO re-add MultipleGestureDetector for image taps in this extension